Ablative black film for directly making plate by flexographic plate computer and preparation method of ablative black film

Abstract

The invention relates to an ablative black film for directly making a plate by a flexographic plate computer and a preparation method of the ablative black film. The ablative black film is characterized by comprising at least one type of nano carbon black particles, one infrared laser ablative dye and two polymer adhesives, a polyether polyurethane compound modified by the first polymer adhesive polyamide and the second polymer adhesive single isocyanate, and a super dispersing agent with the structural formula of R1-X-(CH2CH2O)p-(CHCH3CH2O)q-R2. The laser ablative black film prepared by the method has high sensitivity and good film forming property and is difficult to wrinkle.

Description

technical field [0001] The invention belongs to the technical field of laser ablation imaging, and in particular relates to an ablation black film for computer direct plate making of a flexible plate and a preparation method thereof. Background technique [0002] At present, flexographic printing is widely used in the printing of cartons, flexible packaging, labels and other easily deformed or soft substrates. Usually, a film with a pattern or text is placed on an unexposed flexographic plate containing photoelastomer, exposed to ultraviolet light, and the transparent part of the film passes through ultraviolet light, and the initiator in the photoelastomer decomposes into free radicals, which can initiate crosslinking. Curing by monomer reaction. The area that does not pass through the ultraviolet rays cannot undergo cross-linking reaction, and the difference in solubility in the developer is used to develop a relief image containing text patterns. The plate material afte...

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Problems solved by technology

U.S. Patent US6037102 uses water-soluble polyvinyl alcohol-polyethylene glycol as the main resin, assisted by laser heat-absorbing materials such as carbon black, and realizes laser ablation. However, in order to remove the non-laser ablated area during the plate making process, washing with water is required. , after washing with water, solvent plate making, there are many steps in the operation, different developing systems are used for plate washing, and the user is complicated to use

U.S. Patent US6521390 uses nitrocellulose, carbon black and fatty group diester to form an ablation black film, which has high ablation sensitivity, but the film-forming property of the ablation black film is poor when used, and the black film is easy to wrinkle during plate making, resulting in image and text restoration not good

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